krfb/qtframebuffer.cpp

   1 /* This file is part of the KDE project
   2    Copyright (C) 2007 Alessandro Praduroux <pradu@pradu.it>
   3
   4    This program is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU General Public
   6    License as published by the Free Software Foundation; either
   7    version 2 of the License, or (at your option) any later version.
   8 */
   9
  10 #include "qtframebuffer.h"
  11 #include "qtframebuffer.moc"
  12
  13 #include <QTimer>
  14 #include <QRegion>
  15 #include <QPixmap>
  16 #include <QBitmap>
  17
  18
  19 const int UPDATE_TIME = 500;
  20
  21 QtFrameBuffer::QtFrameBuffer(WId id, QObject *parent)
  22  : FrameBuffer(id, parent)
  23 {
  24     fbImage = QPixmap::grabWindow(win).toImage();
  25     fb = new char[fbImage.numBytes()];
  26     t = new QTimer(this);
  27     connect(t, SIGNAL(timeout()), SLOT(updateFrameBuffer()));
  28 }
  29
  30
  31 QtFrameBuffer::~QtFrameBuffer()
  32 {
  33 }
  34
  35 int QtFrameBuffer::depth()
  36 {
  37     return fbImage.depth();
  38 }
  39
  40 int QtFrameBuffer::height()
  41 {
  42     return fbImage.height();
  43 }
  44
  45 int QtFrameBuffer::width()
  46 {
  47     return fbImage.width();
  48 }
  49
  50 void QtFrameBuffer::getServerFormat(rfbPixelFormat& format)
  51 {
  52     format.bitsPerPixel = 32;
  53     format.depth = 32;
  54     format.trueColour = true;
  55
  56     format.bigEndian = false;
  57     format.redShift = 16;
  58     format.greenShift = 8;
  59     format.blueShift = 0;
  60     format.redMax   = 0xff;
  61     format.greenMax = 0xff;
  62     format.blueMax  = 0xff;
  63 }
  64
  65 void QtFrameBuffer::updateFrameBuffer()
  66 {
  67     QImage img = QPixmap::grabWindow(win).toImage();
  68     QSize imgSize = img.size();
  69
  70
  71     // verify what part of the image need to be marked as changed
  72     // fbImage is the previous version of the image,
  73     // img is the current one
  74
  75 #if 0 // This is actually slower than updating the whole desktop...
  76
  77     QImage map(imgSize, QImage::Format_Mono);
  78     map.fill(0);
  79
  80     for (int x = 0; x < imgSize.width(); x++) {
  81     for (int y = 0; y < imgSize.height(); y++) {
  82     if (img.pixel(x,y) != fbImage.pixel(x,y)) {
  83     map.setPixel(x,y,1);
  84 }
  85 }
  86 }
  87
  88     QRegion r(QBitmap::fromImage(map));
  89     tiles = tiles + r.rects();
  90
  91 #else
  92     tiles.append(img.rect());
  93 #endif
  94
  95     memcpy(fb, (const char*)img.bits(), img.numBytes());
  96     fbImage = img;
  97
  98 }
  99
 100 int QtFrameBuffer::paddedWidth()
 101 {
 102     return fbImage.width() * 4;
 103 }
 104
 105 void QtFrameBuffer::startMonitor()
 106 {
 107     t->start(UPDATE_TIME);
 108 }
 109
 110 void QtFrameBuffer::stopMonitor()
 111 {
 112     t->stop();
 113 }
 114